Charge: murder. Defense: alibi. At D's trial the prosecution offers a
tape recording of a telephone call received by the Boston Police Department
911 emergency operator at 1:09:40 p.m. on March 14. The conversation goes
as follows:

The prosecution also offers the testimony of W, a registered nurse. W
will testify that he was apartment-hunting with a friend on March 14 on
the second floor at 295 Commonwealth Avenue when he heard someone say,
"Get a doctor." W looked into a room through a door left ajar
and saw a woman lying face down on the floor. W asked the woman what happened,
and she replied, "I've been stabbed." W then told the woman
that he was going to call for help. The woman responded, "I've already
called." After he called the police, W went back to the woman and
asked her name. She said, "V." W then checked V's back to determine
if she had any injuries to her spine before turning her over and straightening
her legs. At that point he could see bloodstains on the clothes. He pulled
up the victim's sweater and blouse and exposed a wound just under her
ribcage on her right side. W inquired whether the victim suffered from
any health problems or allergies, and she answered "migraines"
and "mushrooms." W had to repeat his questions. V's responses
were getting slower and weaker. She was getting paler. Her pulse was getting
threadier and faster.

After getting a towel to place on V's wound, W asked V if she could identify
the assailant, and she replied, "Two men." Then W asked her
how old they were, and V said, "In their 20s." W asked her their
height. V said, "About 6 feet, 2 inches." W couldn't get any
further information from V.

Shortly thereafter, a nurse and a doctor arrived at the apartment. V
was lifted to a chair and a sheet was wrapped around her. V's head flopped
forward. At that point W felt that V would not make it. V died two hours
later.

Is either the tape recording or W's testimony admissible? If so, on what
theory?